package main

import (
	"time"
	"fmt"
)

func main() {
	tick:=time.Tick(100*time.Millisecond)
	boom:=time.After(500*time.Millisecond)
	for{
		select {
		case <-tick:
			fmt.Println("tick")
		case <-boom:
			fmt.Println("BOOM!")
		return

		default:
			fmt.Println("     .")
		time.Sleep(50*time.Millisecond)
		}
	}
}
